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Re: [OM] picture link

Subject: Re: [OM] picture link
From: Moose <olymoose@xxxxxxxxx>
Date: Wed, 24 Jun 2009 20:02:36 -0700
Chuck Norcutt wrote:
> Yes, it works for me but how did you do it?  I had to use CA correction tools 
> from ACR or PTLens applied separately to both horizontal and vertical 
> orientations.  But I still didn't get the degree of correction you attained.  

I didn't try any CA correction tools. Like AG, I'm not entirely 
convinced these color fringes are solely lens CA. Even more so now that 
Wayne has pointed out green/magenta fringes.

Even if they were true lens CA, I would probably first try the technique 
Winsor first pointed out, and which I used for both sets of fringe 
colors on this image.

1. Create a copy layer [Ctrl-J]. You will likely need to make it a mask.

2. Image=>Adjustments=>Hue/Saturation [Ctrl-U]

3. In the drop down box at the top, select the color you want to work on.

4. Pull the Saturation slider down until the fringe color disappears.

4. You may fine tune the color range selection with the droppers and.or 
the bottom sliders that control primary range and feathering.

5. You may need a little adjustment of the lightness slider to balance 
the affected area with adjoining areas.

6. In most cases, you will need to make this top layer a mask, make the 
mask black [Ctrl-I], and paint in the areas that need color fringing 
correction with white. Otherwise, the color balance of the rest of the 
image gets  ... odd.

> On the other hand I wasn't working at 200%.  Is that the key?
>   

No. As you can see above, I used an entirely different approach. I only 
worked at the original image size, although I sometimes viewed it on 
screen at more than 100%. 400% makes it a lot easier to be precise in 
using the droppers. I only upsized the crops for display to make the 
effect easier to see.

Moose
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